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TMS320F280048C-Q1: TMS320F280048C-Q1

Part Number: TMS320F280048C-Q1

如上左图所示,DAC的内部参考电压有1.65V和2.5V,当Buffer选择x1档位时,Buffer_DAC的输出范围是0-1.65V,当Buffer选择档位x2时,Buffer_DAC的输出范围是0-3.3V,但上右图所示说档位x1不支持,请问原因是什么?

其他的不支持可以理解,这里的模式不支持不太清楚,还请大佬解答!!!